Apparatus

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sensors Mode-S transponder

A8E4E9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N672UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8E4E9
Octal
52162351
Decimal
11,068,649
Country
US
Tail
N672UA
Type
B763
No current signal · last broadcast Jul 26, 17:25 UTC
Flights observed
191
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:25 UTC

Last known position

Most recent position reported by Mode-S A8E4E9.

Country allocation

The ICAO 24-bit address A8E4E9 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
UAL959 United Airlines 16 2026-07-23
UAL273 United Airlines 14 2026-05-16
UAL134 United Airlines 13 2026-06-01
UAL957 - 11 2026-07-18
UAL956 - 11 2026-07-17
UAL940 - 10 2026-07-16
UAL147 - 10 2026-07-20
UAL135 United Airlines 10 2026-07-26
UAL272 United Airlines 9 2026-05-16
UAL920 United Airlines 8 2026-06-05
UAL12 United Airlines 7 2026-06-02
UAL966 - 6 2026-07-15
UAL15 United Airlines 6 2026-05-31
UAL941 - 5 2026-07-16
UAL967 - 4 2026-07-15
UAL929 United Airlines 4 2026-06-02
UAL928 United Airlines 4 2026-04-26
UAL904 United Airlines 4 2026-07-23
UAL3 United Airlines 4 2026-07-25
UAL938 United Airlines 3 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL135 ZRH → EWR Jul 26, 08:35 UTCJul 26, 17:15 UTC8h 40m
2026-07-25 UAL3 LAX → HNL Jul 25, 21:20 UTCJul 26, 05:20 UTC8h 0m
2026-07-25 UAL3 LAX → HNL Jul 25, 21:32 UTCJul 26, 05:16 UTC7h 44m
2026-07-23 UAL959 LHR → ORD Jul 23, 10:25 UTCJul 23, 18:35 UTC8h 10m
2026-07-23 UAL904 EWR → LHR Jul 23, 00:40 UTCJul 23, 07:35 UTC6h 55m
2026-07-22 UAL31 - Jul 22, 10:20 UTCJul 22, 16:40 UTC6h 20m
2026-07-21 UAL30 EWR → MUC Jul 21, 21:45 UTCJul 22, 05:25 UTC7h 40m
2026-07-21 UAL963 BER → EWR Jul 21, 08:00 UTCJul 21, 16:20 UTC8h 20m
2026-07-20 UAL962 EWR → BER Jul 20, 21:43 UTCJul 21, 05:37 UTC7h 54m
2026-07-20 UAL962 - Jul 20, 22:05 UTCJul 21, 05:45 UTC7h 40m
2026-07-20 UAL147 - Jul 20, 11:30 UTCJul 20, 12:15 UTC45m
2026-07-20 UAL147 LHR → EWR Jul 20, 11:25 UTCJul 20, 18:44 UTC7h 19m
2026-07-20 UAL904 EWR → LHR Jul 20, 02:00 UTCJul 20, 08:59 UTC6h 59m
2026-07-20 UAL904 EWR → LHR Jul 20, 02:30 UTCJul 20, 09:00 UTC6h 30m
2026-07-18 UAL957 - Jul 18, 07:40 UTCJul 18, 09:35 UTC1h 55m
2026-07-18 UAL957 GVA → EWR Jul 18, 07:37 UTCJul 18, 15:36 UTC7h 59m
2026-07-18 UAL957 GVA → EWR Jul 18, 07:37 UTCJul 18, 15:29 UTC7h 52m
2026-07-17 UAL956 EWR → GVA Jul 17, 22:20 UTCJul 18, 05:30 UTC7h 11m
2026-07-17 UAL147 - Jul 17, 11:45 UTCJul 17, 12:15 UTC30m
2026-07-17 UAL147 LHR → EWR Jul 17, 11:45 UTCJul 17, 18:56 UTC7h 11m
2026-07-17 UAL147 LHR → EWR Jul 17, 11:45 UTCJul 17, 18:59 UTC7h 14m
2026-07-17 UAL146 EWR → LHR Jul 17, 03:10 UTCJul 17, 09:40 UTC6h 30m
2026-07-17 UAL146 EWR → EWR Jul 17, 02:54 UTCJul 17, 02:59 UTC5m
2026-07-16 UAL941 - Jul 16, 23:35 UTCJul 16, 23:44 UTC10m
2026-07-16 UAL941 - Jul 16, 16:09 UTCJul 16, 23:44 UTC7h 35m
2026-07-16 UAL941 LHR → EWR Jul 16, 16:04 UTCJul 16, 23:19 UTC7h 15m
2026-07-16 UAL940 EWR → LHR Jul 16, 01:21 UTCJul 16, 08:00 UTC6h 39m
2026-07-16 UAL940 EWR → LHR Jul 16, 01:05 UTCJul 16, 08:05 UTC7h 0m
2026-07-15 UAL967 - Jul 15, 12:30 UTCJul 15, 21:55 UTC9h 25m
2026-07-15 UAL967 NAP → EWR Jul 15, 12:24 UTCJul 15, 21:52 UTC9h 28m
2026-07-15 UAL966 EWR → NAP Jul 15, 01:11 UTCJul 15, 09:07 UTC7h 56m
2026-07-15 UAL966 - Jul 15, 01:00 UTCJul 15, 08:15 UTC7h 15m
2026-07-13 UAL4199 MDE → EWR Jul 13, 15:13 UTCJul 13, 20:05 UTC4h 52m
2026-07-13 UAL4199 MDE → EWR Jul 13, 15:13 UTCJul 13, 19:59 UTC4h 46m
2026-07-10 UAL4201 - Jul 10, 16:50 UTCJul 10, 17:00 UTC10m
2026-06-07 UAL4196 LCQ → ORD Jun 7, 14:05 UTCJun 7, 16:35 UTC2h 30m
2026-06-05 UAL147 LHR → EWR Jun 5, 11:15 UTCJun 5, 18:45 UTC7h 30m
2026-06-05 UAL920 ORD → LHR Jun 5, 00:07 UTCJun 5, 07:17 UTC7h 10m
2026-06-05 UAL920 ORD → LHR Jun 5, 00:00 UTCJun 5, 07:20 UTC7h 20m
2026-06-03 UAL959 LHR → ORD Jun 3, 10:30 UTCJun 3, 11:30 UTC1h 0m
2026-06-03 UAL959 LHR → ORD Jun 3, 10:30 UTCJun 3, 18:40 UTC8h 10m
2026-06-03 UAL959 LHR → ORD Jun 3, 10:30 UTCJun 3, 18:22 UTC7h 52m
2026-06-02 UAL929 ORD → LHR Jun 2, 22:35 UTCJun 3, 06:05 UTC7h 30m
2026-06-02 UAL12 HNL → LAX Jun 2, 08:20 UTCJun 2, 16:45 UTC8h 25m
2026-06-01 UAL134 EWR → ZRH Jun 1, 22:39 UTCJun 2, 05:16 UTC6h 37m
2026-06-01 UAL134 EWR → ZRH Jun 1, 22:20 UTCJun 2, 04:15 UTC5h 55m
2026-05-31 UAL15 LHR → EWR May 31, 15:00 UTCMay 31, 16:15 UTC1h 15m
2026-05-31 UAL15 LHR → EWR May 31, 14:44 UTCMay 31, 22:12 UTC7h 28m
2026-05-31 UAL938 ORD → LHR May 31, 09:40 UTCMay 31, 11:00 UTC1h 20m
2026-05-31 UAL938 ORD → LHR May 31, 03:33 UTCMay 31, 10:52 UTC7h 19m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N672UA page for operator, model, and routing details .

Mode-S A8E4E9 frequently asked

What is Mode-S code A8E4E9?
A8E4E9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N672UA.
Where is Mode-S A8E4E9 registered?
Mode-S code A8E4E9 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A8E4E9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8E4E9, octal 52162351, decimal 11,068,649.
What flights does A8E4E9 operate?
Mode-S A8E4E9 has broadcast 20 distinct callsigns, including UAL959, UAL273, UAL134, UAL957, UAL956.